Polystemma cordatum, synonym Microdactylon cordatum, is a species of plants in the family Apocynaceae, native to the States of Puebla and Oaxaca in Mexico.García-Mendoza, A. J. & J A. Meave. 2011. Diversidad Florística de Oaxaca: de Musgos a Angispermas 1–351. Universidad Nacional Autónoma de México, Ciudad Universitaria. As Microdactylon cordatum it was the only species in the monotypic genus Microdactylon.
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